[Therion] How to use user-defined symbols, Therion Digest, Vol 98, Issue 2

[Bill Gee]

Hi Dave -

Thanks!  I managed to figure out the "secret sauce" today.  I have spent hours 
looking through the Wiki article on Metapost.  What it left out was the 
"u:newname" syntax.  It either is not there or it is so hidden that I never 
found it.  Martin's note from last night was helpful.

I saw your definition for the boss formation and thought about using it.  
However, the standard this map must conform to calls for it to be represented 
as a triangle base with a bar across the top, almost like a table.  The thfill 
line I came up with is ...

        thfill 
(0.2u,-0.4u)--(0.1u,0.2u)--(0.3u,0.2u)--(0.3u,0.4u)--(-0.3u,0.4u)--(-0.3u,0.2u)--(-0.1u,0.2u)--(-0.2u,-0.4u)--
cycle;

Bill Gee



On Monday, February 03, 2014 16:44:11 Dave Clucas wrote:
> Have a look at this.
> http://therion.speleo.sk/wiki/doku.php/metapost
> 
> You will find a symbol which I defined for a stalagmite boss which I guess
> is what you are talking about.
> 
> def p_u_boss (expr pos,theta,sc,al)=
>   T:=identity aligned al rotated theta scaled sc shifted pos;
>   pickup PenD;
>   p := (0.08u,0.25u)..(0,0.29u)..(-0.08u,0.25u);
>   q := (0.16u,0.5u)..(0u,0.58u)..(-0.16u,0.5u);
>   for i=0 upto 9:
>    thdraw p rotated 36i;
>    thdraw q rotated 36i;
>   endfor
>   p := fullcircle scaled 0.15u;
>   thdraw p;
> enddef;
> To use a user defined symbol click on type U in the points drop down and
> then after the U, type in a colon followed by the name of your symbol so,
> in the case of the above "U:boss"
> 
> Dave Clucas
> daveclucas.com
> mycaves.org.
> daveclucas at icloud.com